
AMD Geode SC1200/SC1201 Processor Data Book
89
Signal Definitions
Revision 7.1
3.4.21
Power and Ground Connections1
Signal Name
Ball No.
Type
Description
EBGA
TEPBGA
AVSSPLL2
R3
C16
GND
Analog PLL2 Ground Connection.
AVSSPLL3
E28
AK3
GND
Analog PLL3 Ground Connection.
VPLL2
R1
A17
PWR
3.3V PLL2 Analog Power Connection. Low noise
power for PLL2 and PLL5.
VPLL3
C31
AJ4
PWR
3.3V PLL3 Analog Power Connection. Low noise
power for PLL3, PLL4, and PLL6.
AVCCUSB
AF4
D27
PWR
3.3V Analog USB Power Connection. Low noise
power for USB.
AVSSUSB
AG1
C27
GND
Analog USB Ground Connection.
AVCCCRT
L3, M1, N1
A12, C13, D15
PWR
3.3V Analog CRT DAC Power Connections. Low
noise power.
AVSSCRT
L1, N3, P3
B14, C14, C15
GND
Analog CRT DAC Ground Connections. Return
current.
VCCCRT
K3
D12
PWR
1.8V CRT DAC Digital Power Connection. Can be
directly connected to VCORE on PCB (printed circuit
board).
VSSCRT
K2
C12
GND
CRT DAC Digital Ground Connection. Can be
directly connected to VSS on PCB.
AVCCTV
AC3
D23
PWR
3.3V Analog TV DAC Power Connection. Low noise
power.
AVSSTV
AC4
B24
GND
Analog TV DAC Ground Connection. Return current.
VBAT
D30
AL3
PWR
Battery. Provides battery back-up to the RTC and
ACPI registers, when VSB is lower than the minimum
nected to the internal logic through a series resistor for
UL protection. If battery backup is not desired, connect
VBAT to VSS.
VSB
F29
AL5
PWR
3.3V Standby Power Supply. Provides power to the
Real-Time Clock (RTC) and ACPI circuitry while the
main power supply is turned off.
VSBL
H28
AL6
PWR
1.8V Standby Power Supply. Provides power to the
internal logic while the main power supply is turned off.
This signal requires a 0.1
F bypass capacitor to V
SS.
This supply must be present when VSB is present.
VCORE
(Total of 25)
(Total of 28)
PWR
1.8V Core Processor Power Connections.
VIO
(Total of 31)
(Total of 42)
PWR
3.3V I/O Power Connections.
VSS
(Total of 56)
(Total of 91)
GND
Ground Connections.
1.
All power sources except VBAT must be connected, even if the function is not used.